Extra TopicsExam Tips
Exam Tips for National Grid and Transformers
Part of National Grid & Transformers — GCSE Physics
This exam tips covers Exam Tips for National Grid and Transformers within National Grid & Transformers for GCSE Physics. Revise National Grid & Transformers in Extra Topics for GCSE Physics with 13 exam-style questions and 12 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 11 of 12 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 11 of 12
Practice
13 questions
Recall
12 flashcards
💡 Exam Tips for National Grid and Transformers
🎯 Common Question Types:
- Explain the purpose of step-up/step-down transformers in the National Grid [3 marks]
- Calculate output voltage from turns ratio [2-3 marks]
- Calculate output current from power equation [2-3 marks]
- Explain how a transformer works using electromagnetic induction [4 marks]
- Explain why transformers only work with AC [2 marks]
📝 Key Command Words:
- Explain — give the physics reason using equations where relevant
- Calculate — show your working clearly with substitution into formula
- Describe — outline what happens step by step without full explanation
- State — give a brief answer, no explanation needed
- Identify — name or select the correct option from given information
⚠️ Common Mistakes to Avoid:
- Saying transformers reduce resistance — they reduce current, not resistance
- Mixing up which transformer is step-up and which is step-down in the Grid
- Forgetting that transformers only work with AC, not DC
- Not referencing P = I²R when explaining why high voltage reduces power loss
- Confusing the turns ratio: more turns always on the side with higher voltage